Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I’m doing a per fragment lighting and when correcting normal vecter, i got this code: vec3 f_normal = mat3(MVI) * normal; Where MVI is: mat4 MVI = transpose(inverse(ModelViewMatrix));. So what is return after mat3(MVI) statement?
Returns the upper 3×3 matrix from the 4×4 matrix and multiplies the normal by that. This matrix is called the ‘normal matrix’. You use this to bring your normals from world space to eye space. The upper 3×3 portion of the matrix is important for scale and rotation, while the rest is only for translation (and normals are never translated)
To take a normal from world space to eye space, you just need the 3×3 inverse transpose of the model view matrix. Unless your matrix in othro normal (no non-uniform scale) in that case the original matrix is the same as its inverse transpose.